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Related Party Transactions - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2018
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]          
General, administrative and other     $ 149,961 $ 181,977 $ 152,071
Executive Managing Directors, Employees and Other Related Parties | Amount of Related Party Assets Under Management          
Related Party Transaction [Line Items]          
Assets under management $ 1,900,000   $ 930,100 $ 1,900,000  
Executive Managing Directors, Employees and Other Related Parties | Percent of Related Party Assets Under Management Not Charged Fees          
Related Party Transaction [Line Items]          
Percent of assets under management not charged management and incentive fees 29.00%   41.00% 29.00%  
Mr. Och | Reimbursement of Personal Recapitalization Expenses Incurred          
Related Party Transaction [Line Items]          
General, administrative and other $ 4,500 $ 5,000